Scientists say that a boom in public announcement systems, loudspeakers and automatic doors may be spawning an epidemic of ultrasonic sickness. 

科学家认为，公共广播系统、扩音器、自动门等利用超声波控制的设备日益增多，可能会导致“超声病”的流行。

Even electronic devices designed to scare away mice and cats could be triggering symptoms such as nausea, dizziness, and tiredness, stomach pain, and headaches. 

家用超声波驱鼠（猫）器等电子设备也会使人出现恶心、眩晕、疲倦、胃痛以及头痛等症状。

Schools, railways stations, sports grounds, museums, libraries and swimming pools are all potential sources of exposure. 

学校、火车站、体育场、博物馆、图书馆甚至游泳池都是超声波“重灾区”。

Scientists are not sure how ultrasound may harm health but one possibility is that it disturbs the delicate balance sensors in the ear, confusing the brain and calling seasickness-like symptoms. 

科学家尚不确定超声波会如何损害健康，但它有可能会影响耳朵中精密的平衡感应器，令大脑感到“困惑”，从而引发各种眩晕恶心症状。